Means for converting a continuous rotary motion into an intermittent motion



Nov. 6 1923. 1,473,493

G MICHETTI MEANS FOR CONVERTING A CONTINUOUS ROTARY MOTION INTO AN INTERMITTENT MOTION Filed 001:. 3. 1.921

Patented Nov. 6, i923.

UNETEQ- STATES earner eerie I eron-sro rircnnr'rr, on norm, ITALY.

MOTION.

Application filed October 3, 1921. Serial No. 504,981.

To aZZ whom it may concern Be it known that I, Groneio Mrorrn'r'rr, subject of the King of Italy, residing at 3 Lungotevere Castello, Rome, Italy, have invented anew and useful Improvement in Means for Converting a Continuous Itotary Motion into an Intermittent Motion; and I do hereby declare the following to be a full, clear, and exact description of the same. j V

A constructional form of the invention is shown, by way of examplain the accompanying drawing, wherein Figure l is a sectional view and Figure 2 is an elevation of the device constructed in accordance with the invention.

In the drawing, 1 indicates a' disc. preferably of fibre or like material, which has a continuous rotary motion imparted to it by a shaft 2. The disc is provided, in the constructional form shown, with six teeth 3, 3 projecting from the rim of the disc at uniform distance apart. On opposite sides of the disc are secured two plates i, 4:, made of sheet metal and having peripheral flanges l facing inwardly towards one another.

The flanges 4 allow a continuous circum ferential gap between their facing edges, and they are notched at suitable intervals as at 4", these notches being provided immediately in front of each tooth 3 and at intermediate points between each pair of teeth,

The notches-4" are not oppositeto one another but they are arranged in alternate pairs, one pair being provided in the right hand flange, the next pair in the left hand flange. and so on, and the arrangement is such that each notch cooperating with a tooth 3 is followed by an oppositely arranged notch. but is preceded by a notch extending in the same direction.

A star-shaped member 5 is arranged within reach of the disc 1 and has in the example shown six arms 6 projecting from its rim through the gap between the flanges 4- into the path of the teeth 3, so that each arm successively will be engaged by the co-operating tooth of the disc 1 and be carried along thereby. producing an intermittent movement of the driven member 5. The arms are enlarged or widened out laterally at their ends to provide lugs 6, as seen in Figure 2, the width of these ends and their uni-lateral extensions being greater than the gap be- 7 tween the flanges 4 but less than the distance across'the gap and one of the notches; 4".

The lugs 6' project to theright on one arm, to the left'on thenext arm, and so on. .This arrangement allows the passage. of the widened ends and lugs 6 through the guidesurface formed by the flanges 4, but between their movements the arms 6 rest with their lugs 6 in contact with the. outer surfaces of the flanges 4 whilethe disc l rctates idly. i 7

When the arms6 are entering into engage ment with the toothed discv l, the lugs 6 pass. inwards through the intermediate notches between the pairs, of teeth 3; dur-I -ingzthe period of rest, the arm '6 lies in the gap between the flanges on the rotating disc; upon engagement by the, following tooth 3, the arm 6 moves outwardly from the disc, its lug 6 passing freely through the right or left handed notch located immediately in front of'the tooth.

A spring 8 covered on its upper face with 7 leather or like material as indicated at 7, provides resilient contact between the arms 6 and the guide-surface l, 4: and serves to prevent oscillations of the star-shaped member-as well as to-deaden the noise. length of the spring is such thatv its extremity in yielding to the arm 6 when the wheel 5 is rotated by the toothed disc 1, sinks into thegap between the notched flanges, but as soon as the arm has passed to the interior of the flanges at the spring returns to its former position ready to engage the nextarm.

It will thus be seen that of each pair of right or left hand notches the first notch serves for the entrance of an arm and the second one for the exit of the same arm, and that each arm pressed against the continuously rotating member by the indirect action of the spring 7, will have a notch passing beneath it which extends in the opposite direction to that of the projection or lug upon the arm.

It is evident that as the disc 1 rotates. its teeth will successively be brought into en gagement with the arms 6 of the member The 5 which will thus be rotated withan intermittent motion. The arms 6 which control the travel of the film have a much longer radius than that of the drum 9 which trans ries of arms, with oflset lugs at their ends,

. the peripheral slot completely encircling the drum, the slot having notches for permitting'entran'ce into, "and exit from, the drum,

of the arms of the star wheel, whereby, through the medium of said toothed disk, an intermittent rotary motion is imparted to the star wheel, by continuous rotation of the drum, the lugs on the star wheel arms, extending alternately to the right'andto the left, and the notches "in the drum slot being arranged alternately, and in pairs, to the right and tothe left of the slot.

2. A motion converting device comprising a continuously rotatable, peripherally slotted, actuating drum," a toothed disk' rotatable with the drum, an intermittently rotatable actuated star wheel, said star wheel having a series of arms, with ofiset lugs at their ends, the peripheral slot completely encircling the drum, the slot having notches for permitting entrance into, and exit from the drum of the arms of the star wheel, whereby, through the medium of said toothed disk, an intermittent rotary motion is imparted to the star wheel, by continuous rotation of the drum, in combination with a compensating spring, to bear against the ends of the star wheel arms, for holding an arm of the star wheel against the periphery of the drum, during the periods of rest of the star wheel.

3. A device according to claim 1, in combination with a compensating xspring,to bear against the ends of the star wheel arms, for holding an arm of the star wheel against the periphery of the drum, during the periods of rest of the star wheel.

4. A device according to claim 2 said spring being a leaf spring, working, at times, in the slot in the drum. 7

5. A device according to claim 3, said spring being a leaf spring, working, at times, in the slot in the drum.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

GIORGIO MICHETTI. V 

